An enhanced stability and efficiency of SPEEK-based composite membrane influenced by amphoteric side-chain polymer for vanadium redox flow battery

Sulfonated poly(ether ether ketone) (SPEEK) based composite membranes for vanadium redox flow battery (VRFB) are fabricated through blending various contents of sulfonated poly (aryl ether sulfone) (SPAES) containing sulfoalkylamine chains. Influenced by the pendant sulfoalkyl groups of SPAES, an enhanced synergistic proton transport channel is formed, showing a trade-off balance between proton conductivity and permeability. The SPEEK/SPAES-15...